Greenhouse planting environment control method and system for sand cultivation of celery production

Abstract

The application relates to the technical field of greenhouse planting environment control, in particular to a greenhouse planting environment control method and system for sand culture celery production, which comprises the following steps: acquiring planting environment parameters in a greenhouse, analyzing the correlation between light intensity and air temperature and humidity in the greenhouse to obtain the synchronism influence degree of the light intensity on the air temperature and humidity, calculating the high-humidity-heat aggravation significance of the environment in the greenhouse, obtaining the coupling effect influence degree through the correlation between the sand culture celery soil water content and the light intensity and air humidity, calculating the coupling effect imbalance degree, combining the high-humidity-heat aggravation significance of the environment in the greenhouse to obtain the non-steady-state abnormality degree of the greenhouse environment, and determining the opening and closing conditions of the sunshade curtain and the greenhouse ventilation window of the greenhouse to control the planting environment in the greenhouse. The application improves the effectiveness of the planting environment control in the greenhouse, and avoids the influence of the greenhouse planting environment on the healthy growth and yield improvement of the sand culture celery.

Description

Technical Field

[0001] This application relates to the field of greenhouse planting environment control technology, specifically to a method and system for controlling the greenhouse planting environment for sand-cultured celery production. Background Technology

[0002] Currently, greenhouses are the primary method for producing sand-cultured celery. Greenhouses provide essential off-season conditions such as temperature, light, and fertility for the normal growth of sand-cultured celery. Existing technologies largely employ intelligent control of the greenhouse growing environment, and this intelligent control offers significant advantages in areas such as environmental factor coupling, environmental parameter analysis, and nonlinear prediction. Intelligent control of the greenhouse growing environment can effectively promote the growth of sand-cultured celery, which is of significant practical importance for crop growth in greenhouses.

[0003] Because the temperature and humidity inside greenhouses fluctuate unpredictably and non-linearly, current technologies mostly rely on sensors to monitor environmental parameters in real time. These real-time parameters are then compared with historical values ​​to control the greenhouse planting environment. However, the relatively enclosed environment of greenhouses makes them prone to high humidity and high heat. Current technologies do not adequately consider the coupled effects of environmental factors on the growth of sand-cultivated celery, resulting in poor effectiveness in controlling the greenhouse planting environment and consequently impacting the healthy growth and yield of sand-cultivated celery. Summary of the Invention

[0004] To address the aforementioned technical problems, the purpose of this application is to provide a method and system for controlling the greenhouse cultivation environment for sand-cultured celery production. The specific technical solution adopted is as follows:

[0005] This application provides a method for controlling the greenhouse planting environment for sand-cultured celery production, including the following steps:

[0006] The parameters of the planting environment inside the greenhouse are obtained, specifically including: the light intensity, air temperature, humidity and soil moisture content inside the greenhouse within a preset time period before each collection time are arranged in time sequence to form the light intensity sequence, air temperature sequence, air humidity sequence and soil moisture content sequence at each collection time.

[0007] By analyzing the synchronicity of the correlation between light intensity and air temperature and humidity in the greenhouse, and combining the changes in the correlation between light intensity and air temperature and humidity, the synchronicity influence of light intensity on air temperature and humidity in the greenhouse at each collection time was obtained.

[0008] Based on the changing trends of air temperature and humidity inside the greenhouse and the synchronicity influence at each collection time, the significance of the aggravation of high humidity and heat in the greenhouse environment at each collection time is obtained. By examining the correlation between soil moisture content, light intensity, and air humidity inside the greenhouse, the coupling effect influence at each collection time is obtained. Based on the changes in the coupling effect influence, the coupling imbalance at each collection time is obtained. Finally, combined with the significance of the aggravation of high humidity and heat in the greenhouse environment at each collection time, the non-steady-state anomaly of the greenhouse environment at each collection time is obtained.

[0009] Based on the degree of non-steady-state anomaly in the greenhouse environment, the opening and closing status of the greenhouse shading curtains and ventilation windows is set to control the greenhouse planting environment.

[0010] Preferably, the method for calculating the synchronicity of the influence of light intensity inside the greenhouse on air temperature and humidity at each sampling time is as follows:

[0011] In the formula, Let be the degree of synchronicity between light intensity inside the greenhouse and air temperature and humidity at the t-th data collection time. Let be the degree of similarity between the first correlation sequence and the second correlation sequence at the t-th acquisition time. and Let be the permutation entropy of the first correlation sequence and the second correlation sequence at the t-th acquisition time. To avoid constants with a denominator of 0.

[0012] Preferably, the construction of the first correlation sequence and the second correlation sequence further includes:

[0013] The correlation between the light intensity sequence and the air temperature sequence and the air humidity sequence at each collection time is calculated separately, and these are used as the first correlation and the second correlation at each collection time. The first correlation and the second correlation within a preset time period before each collection time are arranged in chronological order to obtain the first correlation sequence and the second correlation sequence at each collection time.

[0014] The preferred method for obtaining the significance of increased humidity and heat in the greenhouse environment at each sampling time is as follows:

[0015] The first-order difference sequences of the air temperature and air humidity sequences at each collection time are calculated respectively. The ratio of the number of positive elements in the two first-order difference sequences to the total number of elements is calculated respectively. Combined with the synchronicity influence degree corresponding to each collection time, the significance of the high humidity and heat aggravation in the greenhouse environment at each collection time is obtained.

[0016] Preferably, the significance of the aggravation of high humidity and heat in the greenhouse environment at each collection time is the product of the mean of the two ratios and the degree of synchronicity influence.

[0017] Preferably, the method for obtaining the coupling effect influence degree at each collection time is as follows: statistically analyze the correlation degree between the soil moisture content sequence at each collection time and the light intensity sequence and the air humidity sequence, and take the sum of the absolute values ​​of the two correlation degrees as the coupling effect influence degree at each collection time.

[0018] Preferably, the method for obtaining the coupling imbalance at each acquisition moment is as follows:

[0019] The coupling effect influence of all acquisition times within a preset time period before each acquisition time is arranged in chronological order to obtain the coupling effect influence sequence of each acquisition time. The mean of the absolute values ​​of all elements in the first difference sequence of the coupling effect influence sequence of each acquisition time is taken as the coupling effect imbalance of each acquisition time.

[0020] Preferably, the degree of non-steady-state anomaly of the greenhouse environment at each sampling time is the normalized result of the product of the significant aggravation of high humidity and heat in the greenhouse environment at each sampling time and the degree of imbalance of coupling effect.

[0021] Preferably, the setting of the opening and closing status of the greenhouse shading curtains and ventilation windows further includes:

[0022] If the non-steady-state anomaly at the current data collection time is greater than the second steady-state threshold, then open the greenhouse shading curtain and the greenhouse ventilation window until the non-steady-state anomaly is less than the first steady-state threshold, then close the greenhouse shading curtain and the greenhouse ventilation window.

[0023] If the non-steady-state anomaly degree at the current data collection time is less than or equal to the second steady-state threshold, then the shade curtain and ventilation windows of the greenhouse should be closed.

[0024] A first steady-state threshold and a second steady-state threshold are preset, wherein the second steady-state threshold is greater than the first steady-state threshold.

[0025] This application also provides a greenhouse planting environment control system for sand-cultured celery production, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of any of the above-described greenhouse planting environment control methods for sand-cultured celery production.

[0026] As can be seen from the above, the greenhouse cultivation environment control method and system for sand-cultured celery production provided in this application have at least the following beneficial effects:

[0027] Given that existing technologies for controlling the planting environment within greenhouses do not fully consider the coupled effects of environmental factors on the growth of sand-cultivated celery, the effectiveness of controlling the planting environment within greenhouses is poor, thus affecting the healthy growth and yield increase of sand-cultivated celery. Therefore, this application analyzes the synchronicity characteristics of the influence of light intensity on air temperature and humidity within greenhouses. Based on these synchronicity characteristics, it more accurately reflects the impact of light on air temperature and humidity within greenhouses, thereby more accurately measuring the severity of high temperature and humidity within greenhouses, which is beneficial for more effective control of the planting environment within greenhouses in the future.

[0028] Furthermore, by analyzing the coupling effect of light intensity and air humidity in the greenhouse on soil moisture, and accurately extracting the characteristics of the imbalance of coupling effect, the subsequent control of the planting environment in the greenhouse can fully consider the coupling effect of environmental factors on the growth of sand-cultured celery.

[0029] Furthermore, based on the severity of high humidity and heat inside the greenhouse and the characteristics of coupling imbalance, the non-steady-state anomaly degree of the greenhouse environment is accurately measured, and the non-steady-state anomaly degree of the greenhouse environment is monitored in real time. This determines whether to open or close the greenhouse shading curtains and ventilation windows, thereby controlling the greenhouse planting environment, improving the effectiveness of controlling the planting environment inside the greenhouse, and avoiding the greenhouse planting environment from affecting the healthy growth and yield increase of sand-cultivated celery. Attached Figure Description

[0030] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A flowchart illustrating the steps of the greenhouse cultivation environment control method for sand-cultured celery production provided in this application. Detailed Implementation

[0032] To further illustrate the technical means and effects adopted by this application to achieve the intended purpose of the invention, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of the greenhouse cultivation environment control method and system for sand-cultured celery production proposed in this application. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0033] Unless otherwise specified and limited, terms such as “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the article or device that includes said element. Furthermore, the term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] The following, in conjunction with the accompanying drawings, details the specific scheme of the greenhouse cultivation environment control method and system for sand-cultured celery production provided in this application.

[0035] Please see Figure 1 The document illustrates a flowchart of a method for controlling the greenhouse cultivation environment for sand-cultured celery production according to an embodiment of this application, including the following steps:

[0036] Step 1: Obtain the planting environment parameters inside the greenhouse, specifically including: arranging the light intensity, air temperature, humidity and soil moisture content inside the greenhouse within a preset time period before each collection time in chronological order, forming the light intensity sequence, air temperature sequence, air humidity sequence and soil moisture content sequence for each collection time.

[0037] In the greenhouse where sand-cultivated celery is grown, a wireless sensor acquisition module collects data on multiple environmental parameters in the growing environment. The wireless sensors include a light intensity sensor, an air temperature and humidity sensor, and a soil moisture sensor. The light intensity sensor and the air temperature and humidity sensor collect data on the light intensity and air temperature and humidity in the greenhouse, respectively. At the same time, the soil moisture sensor collects data on the soil moisture content of the sand-cultivated celery in the greenhouse. The time interval for collecting the environmental parameters is 5 seconds. The implementer can adaptively set the time interval according to actual needs.

[0038] Furthermore, in order to accurately analyze the coupled effects of multiple environmental parameters on the growth of sand-cultivated celery at different times, light intensity, air temperature and humidity, and soil moisture content of sand-cultivated celery were constructed for each collection time based on the light intensity, air temperature and humidity, and soil moisture content of sand-cultivated celery within a preset time period before each collection time.

[0039] Preferably, in this embodiment, to improve data accuracy, the light intensity, air temperature and humidity, and soil moisture content of the sand-cultured celery in the greenhouse are filtered. The filtering algorithm can be either the LMS adaptive filtering algorithm or the Kalman filtering algorithm; this embodiment uses the Kalman filtering algorithm. In this embodiment, the preset duration is one hour; however, in actual application scenarios, the implementer can set the duration as needed. Furthermore, to avoid the influence of different data units on the greenhouse environment analysis, the filtered planting environment parameters are arranged into a sequence according to time order, and each planting environment parameter sequence is Z-score standardized. In this embodiment, the standardized results are recorded as the light intensity sequence, air temperature sequence, air humidity sequence, and soil moisture content sequence at each collection time.

[0040] Step 2: By analyzing the degree of synchronization between the light intensity inside the greenhouse and the air temperature and humidity, and combining the changes in the correlation between light intensity and air temperature and humidity, the degree of synchronicity influence of light intensity inside the greenhouse on air temperature and humidity at each collection time is obtained.

[0041] To ensure the healthy growth and increase the yield of sand-cultivated celery in greenhouses, it is necessary to control the greenhouse planting environment to reduce the occurrence of celery diseases and pests. However, current technologies for controlling the greenhouse planting environment do not fully consider the coupled effects of environmental factors on the growth of sand-cultivated celery, resulting in poor effectiveness of environmental control. Therefore, to more effectively control the greenhouse planting environment, it is necessary to accurately analyze the coupled effects of planting environmental factors on the growth of sand-cultivated celery.

[0042] Furthermore, the correlation between the light intensity sequence and the air temperature sequence at each acquisition time is calculated and denoted as the first correlation at each acquisition time. Simultaneously, the correlation between the light intensity sequence and the air humidity sequence at each acquisition time is calculated and denoted as the second correlation at each acquisition time. The first and second correlations reflect the degree to which the air temperature and humidity in the greenhouse are affected by light intensity, respectively. The correlation between the sequences can be measured by covariance or Pearson correlation coefficient. In this embodiment, covariance is used to measure the correlation between the sequences. If the similarity between the first and second correlations monitored in real time is higher and the difference between the first and second correlations is smaller, it better reflects the synchronous characteristics of the influence of light intensity on the temperature and humidity in the greenhouse air environment. At this time, it is easier to cause high humidity and high heat in the greenhouse planting environment, thereby affecting the normal growth of sand-cultured celery in the greenhouse. At this time, it is more necessary to effectively control the planting environment in the greenhouse.

[0043] Therefore, by monitoring the first and second correlations in real time, in this embodiment, the first and second correlations are arranged in ascending order of time one hour before each collection time to obtain the first and second correlation sequences at each collection time, which respectively reflect the changes in the relationship between light intensity and air temperature and humidity in the greenhouse environment.

[0044] Based on the above analysis, the degree of synchronicity between light intensity inside the greenhouse and air temperature and humidity at each data collection time was calculated:

[0045] ;

[0046] In the formula, Let be the degree of synchronicity between light intensity inside the greenhouse and air temperature and humidity at the t-th data collection time. Let be the similarity between the first and second correlation sequences at the t-th acquisition time. The similarity can be measured by cosine similarity, dynamic programming distance, or Euclidean distance. In this embodiment, cosine similarity is used to measure the similarity. The greater the similarity, the more similar the first and second correlation sequences are. and Let be the permutation entropy of the first correlation sequence and the second correlation sequence at the t-th acquisition time. To avoid constants with a denominator of 0, the value range is (0.01, 0.06). In this embodiment, the value is 0.05. The calculation of similarity and permutation entropy are well-known techniques and will not be elaborated further.

[0047] Synchronicity influence reflects the synchronicity characteristics of the effect of light intensity on air temperature and humidity in a greenhouse. The higher the synchronicity, the easier it is to cause high humidity and high heat in the greenhouse planting environment. Since sand-cultivated celery is planted relatively densely, it is more likely to be susceptible to pests and diseases in a high humidity and high heat greenhouse planting environment. Therefore, it is more important to effectively control the planting environment in the greenhouse.

[0048] Step 3: Based on the changing trends of air temperature and humidity inside the greenhouse and the synchronicity influence at each sampling time, obtain the significance of the aggravation of high humidity and heat in the greenhouse environment at each sampling time. By examining the correlation between soil moisture content, light intensity, and air humidity inside the greenhouse, obtain the coupling effect influence at each sampling time. Based on the changes in the coupling effect influence, obtain the coupling imbalance at each sampling time. Then, combined with the significance of the aggravation of high humidity and heat in the greenhouse environment at each sampling time, obtain the non-steady-state anomaly degree of the greenhouse environment at each sampling time.

[0049] Generally, if the intensity of light in the greenhouse used for growing sand-cultivated celery has a higher synchronous influence on air temperature and humidity, and the air temperature and humidity in the greenhouse show a more significant upward trend, it will exacerbate the severity of high humidity and high heat in the greenhouse, and more easily cause adverse effects on the production of sand-cultivated celery. In this case, it is necessary to effectively control the greenhouse planting environment in a timely manner.

[0050] Furthermore, the first-order difference sequences of the air temperature and air humidity sequences at each collection time were calculated, and the ratio of the number of positive elements in each of the two first-order difference sequences to the total number of elements was counted. The larger the ratio, the stronger the upward trend of air temperature and humidity in the greenhouse. The product of the mean of the two ratios and the synchronicity influence at each collection time was recorded as the significance of the high humidity and heat aggravation in the greenhouse environment at each collection time. The significance of the high humidity and heat aggravation reflects the severity of high humidity and high heat in the greenhouse under the influence of light intensity. By combining the synchronicity characteristics of the influence of light intensity on air temperature and humidity, the influence of light on air temperature and humidity in the greenhouse can be more accurately reflected, thereby more accurately measuring the severity of high humidity and heat in the greenhouse, which is conducive to more effective control of the planting environment of sand-cultured celery in the greenhouse.

[0051] Meanwhile, changes in light intensity and air humidity affect soil moisture evaporation. The soil moisture content in greenhouses is affected by the coupling effect of light intensity and air humidity. The greater the difference in the changes of the coupling effect, the more significant the imbalance of the coupling effect of light intensity and air humidity on soil moisture in greenhouses, and the more likely it is to affect the stability of soil moisture in greenhouses, thus affecting the growth of sand-cultured celery. Therefore, it is more necessary to effectively control the planting environment in greenhouses in a timely manner.

[0052] Therefore, in order to analyze the coupling effect of light intensity and air humidity on soil moisture content in greenhouses, the light intensity sequence, air humidity sequence, and soil moisture content sequence at each collection time were input into the Grey Relational Analysis algorithm. The soil moisture content sequence was used as the parent sequence, and the light intensity sequence and air humidity sequence were used as the two child sequences. The Grey Relational Analysis algorithm was used to obtain the correlation degree between the parent sequence and the two child sequences. The sum of the absolute values ​​of the two correlation degrees was used as the coupling effect degree at each collection time. The coupling effect degree reflects the coupling effect of light intensity and air humidity on soil moisture in greenhouses. The Grey Relational Analysis algorithm is a well-known technology and will not be described in detail.

[0053] Furthermore, by real-time monitoring of the coupling effect of light intensity and air humidity on soil moisture in the greenhouse, the coupling effect degree of all collection times within one hour before each collection time is arranged in chronological order to obtain the coupling effect degree sequence of each collection time. The greater the difference in the change of the coupling effect degree sequence, the more significant the imbalance of the coupling effect of light intensity and air humidity on soil moisture in the greenhouse.

[0054] Therefore, the first-order difference sequence of the coupling effect influence sequence at each collection time is calculated, and the mean of the absolute values ​​of all elements in the first-order difference sequence is taken as the coupling effect imbalance at each collection time. The coupling effect imbalance reflects the imbalance characteristics of the coupling effect of light intensity and air humidity on soil moisture. The higher the coupling effect imbalance characteristic, the stronger the non-steady state of the planting environment in the greenhouse. At this time, it is more necessary to control the greenhouse planting environment for sand-cultured celery in a timely manner to avoid the phenomenon of steady-state imbalance of environmental factors in the greenhouse.

[0055] Furthermore, the normalized result of the product of the significance of the aggravation of high humidity and heat in the greenhouse environment at each collection time and the imbalance of the coupling effect is denoted as the non-steady-state anomaly of the greenhouse environment at each collection time. The non-steady-state anomaly can reflect the degree of aggravation of high humidity and heat in the greenhouse environment and the imbalance of the coupling effect of light intensity and air humidity on soil moisture. The larger the non-steady-state anomaly, the higher the influence of light intensity in the greenhouse where sand-cultured celery is grown, and the easier it is for the soil moisture in the greenhouse where sand-cultured celery is grown to evaporate excessively, thus causing the phenomenon of high humidity and heat in the greenhouse environment.

[0056] Step 4: Based on the degree of non-steady-state anomaly in the greenhouse environment, set the opening and closing status of the greenhouse shading curtains and ventilation windows to control the greenhouse planting environment.

[0057] Furthermore, in this embodiment, the greenhouse planting environment is controlled by real-time monitoring of the non-steady-state anomaly degree of the greenhouse environment and by setting a first steady-state threshold of 0.6 and a second steady-state threshold of 0.8. The second steady-state threshold is greater than the first steady-state threshold, and the implementer can set it according to the actual application scenario. Specifically, if the non-steady-state anomaly degree at the current collection time is greater than the second steady-state threshold, it indicates that the greenhouse environment for planting sand-cultured celery is experiencing high humidity and high heat. At this time, the greenhouse shading curtain and the greenhouse ventilation windows are opened until the real-time monitored non-steady-state anomaly degree is less than the first steady-state threshold. Then, the greenhouse shading curtain and the greenhouse ventilation windows are closed.

[0058] If the non-steady-state anomaly degree at the current collection time is less than or equal to the second steady-state threshold, it indicates that there is no high humidity and high heat phenomenon in the greenhouse where sand-cultivated celery is planted. At this time, the temperature and humidity in the greenhouse are within a controllable range. In order to avoid adverse effects on the growth environment of sand-cultivated celery, the shade curtains and ventilation windows of the greenhouse are closed.

[0059] Based on the same inventive concept as the above methods, this application also provides a greenhouse planting environment control system for sand-cultivated celery production, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of any one of the above-described methods for controlling the greenhouse planting environment for sand-cultivated celery production.

[0060] It is understood that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, the above description focuses on specific embodiments of this specification. Additionally, the processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some implementations, multitasking and parallel processing are possible or may be advantageous.

[0061] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0062] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Any equivalent structural or procedural transformations made based on the description and drawings of this application, or direct or indirect applications in other related technical fields, are similarly included within the protection scope of this application.

Claims

1. A method for controlling the greenhouse planting environment for sand-cultured celery production, characterized in that, Includes the following steps: The parameters of the planting environment inside the greenhouse are obtained, specifically including: the light intensity, air temperature, humidity and soil moisture content inside the greenhouse within a preset time period before each collection time are arranged in time sequence to form the light intensity sequence, air temperature sequence, air humidity sequence and soil moisture content sequence at each collection time. By analyzing the synchronicity of the correlation between light intensity and air temperature and humidity in the greenhouse, and combining the changes in the correlation between light intensity and air temperature and humidity, the synchronicity influence of light intensity on air temperature and humidity in the greenhouse at each collection time was obtained. Based on the changing trends of air temperature and humidity inside the greenhouse and the synchronicity influence at each collection time, the significance of the aggravation of high humidity and heat in the greenhouse environment at each collection time is obtained. By examining the correlation between soil moisture content, light intensity, and air humidity inside the greenhouse, the coupling effect influence at each collection time is obtained. Based on the changes in the coupling effect influence, the coupling imbalance at each collection time is obtained. Finally, combined with the significance of the aggravation of high humidity and heat in the greenhouse environment at each collection time, the non-steady-state anomaly of the greenhouse environment at each collection time is obtained. Based on the degree of non-steady-state anomaly in the greenhouse environment, the opening and closing status of the greenhouse shading curtains and ventilation windows is set to control the greenhouse planting environment.

2. The greenhouse cultivation environment control method for sand-cultured celery production as described in claim 1, characterized in that, The method for calculating the synchronicity of the influence of light intensity inside the greenhouse on air temperature and humidity at each data collection time is as follows: In the formula, Let be the degree of synchronicity between light intensity inside the greenhouse and air temperature and humidity at the t-th data collection time. The similarity between the first and second correlation sequences at the t-th acquisition time is given by... and Let be the permutation entropy of the first correlation sequence and the second correlation sequence at the t-th acquisition time. To avoid constants with a denominator of 0.

3. The method for controlling the greenhouse planting environment for sand-cultured celery production as described in claim 2, characterized in that, The construction of the first correlation sequence and the second correlation sequence further includes: The correlation between the light intensity sequence and the air temperature sequence and the air humidity sequence at each collection time is calculated separately, and these are used as the first correlation and the second correlation at each collection time. The first correlation and the second correlation within a preset time period before each collection time are arranged in chronological order to obtain the first correlation sequence and the second correlation sequence at each collection time.

4. The method for controlling the greenhouse planting environment for sand-cultured celery production as described in claim 1, characterized in that, The method for obtaining the significance of the aggravation of high humidity and heat in the greenhouse environment at each collection time is as follows: The first-order difference sequences of the air temperature and air humidity sequences at each collection time are calculated respectively. The ratio of the number of positive elements in the two first-order difference sequences to the total number of elements is calculated respectively. Combined with the synchronicity influence degree corresponding to each collection time, the significance of the high humidity and heat aggravation in the greenhouse environment at each collection time is obtained.

5. The greenhouse cultivation environment control method for sand-cultured celery production as described in claim 4, characterized in that, The significance of the aggravation of high humidity and heat in the greenhouse environment at each collection time is the product of the mean of the two ratios and the synchronicity influence.

6. The method for controlling the greenhouse planting environment for sand-cultured celery production as described in claim 1, characterized in that, The method for obtaining the coupling effect degree at each collection time is as follows: the correlation degree between the soil moisture content sequence at each collection time and the light intensity sequence and the air humidity sequence are calculated, and the sum of the absolute values ​​of the two correlation degrees is taken as the coupling effect degree at each collection time.

7. The method for controlling the greenhouse planting environment for sand-cultured celery production as described in claim 1, characterized in that, The method for obtaining the coupling imbalance at each acquisition moment is as follows: The coupling effect influence of all acquisition times within a preset time period before each acquisition time is arranged in chronological order to obtain the coupling effect influence sequence of each acquisition time. The mean of the absolute values ​​of all elements in the first difference sequence of the coupling effect influence sequence of each acquisition time is taken as the coupling effect imbalance of each acquisition time.

8. The method for controlling the greenhouse planting environment for sand-cultured celery production as described in claim 1, characterized in that, The unsteady-state anomaly degree of the greenhouse environment at each collection time is the normalized result of the product of the significant aggravation of high humidity and heat in the greenhouse environment at each collection time and the imbalance degree of coupling effect.

9. The method for controlling the greenhouse planting environment for sand-cultured celery production as described in claim 1, characterized in that, The setting of the opening and closing status of the greenhouse's shading curtains and ventilation windows further includes: If the non-steady-state anomaly at the current data collection time is greater than the second steady-state threshold, then open the greenhouse shading curtain and the greenhouse ventilation window until the non-steady-state anomaly is less than the first steady-state threshold, then close the greenhouse shading curtain and the greenhouse ventilation window. If the non-steady-state anomaly degree at the current data collection time is less than or equal to the second steady-state threshold, then the shade curtain and ventilation windows of the greenhouse should be closed. A first steady-state threshold and a second steady-state threshold are preset, wherein the second steady-state threshold is greater than the first steady-state threshold.

10. A greenhouse cultivation environment control system for sand-cultured celery production, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the greenhouse planting environment control method for sand-cultured celery production as described in any one of claims 1-9.

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